Free Preflop Range Builder — browser-based, no signup

I've been building a range builder tool for studying preflop play and wanted to share it here for feedback.

Link: https://jassotv.github.io/poker-range-bu...

Features:
- 6 positions (BTN/CO/HJ/UTG/SB/BB), each with open / vs limp / vs raise situations
- Antes toggle
- Local storage save (nothing sent to any server)
- Export grid as PNG
- Sidebar with lexicon and Raise-or-Fold philosophy

Pro version (€2.99 one-time): quiz mode that tests you on YOUR saved ranges, 3 preset levels (Tight / Solid / Expert based on solver data), import/export JSON

Would love feedback on the preset ranges especially — they're based on PokerCoaching solver data but I'm sure there's room to improve.

Thanks